PCI-1202/1602/180x Series Card
Multi-Function Boards
User Manual/ Ver. 4.8/ Mar. 2015/ PMH-0014-48/ Page: 27
Figure 2.4-5:
Differential input with floating signal source
A/D CH 0 HI
A/D CH 0 LO
A/D CH n HI
A.GND
A/D CH n LO
A.GND
Es 1
Es n
100 k
Ω
~ 10 M
Ω
100 k
Ω
~ 10 M
Ω
PEX-1202 and
PCI-1202/1602/1800/1802 series
Figure 2.4-6:
Connecting to a 4 ~ 20 mA Source
A/D CHn
AGND
R
+
-
(Shunt Resistor)
Example:
A 20 mA source current through a 125 Ω resistor (e.g. 125 Ω, 0.1% DIP Resistors) between
+ and – terminals and the board will read a 2.5 V
DC
voltage. You can use the
I = V/R
(Ohm’s law) to
calculate what value the source current should have.
Current (I) = Voltage (V) / Resistance (R)
= 2.5 V / 125 Ω
= 0.02 A
= 20 m